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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f71d15c6066a3c31d12619cf04ab924ef3e9114e7ae152663bf60f4636ad5c' 
  AND token = 'jNVvxS3SiZZuR8ExOfKfnMMmxGL51Ry19yLKviTj6Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

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