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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd6960e91bd59e7e7e807ffb1be68a118db303d732f96e11f3ba2cfa90a2b118' 
  AND token = 'Ci/qqokDwLwxgdgNso3wPaxNJtIDgwNimFFryatxJjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}