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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70d883798874fc5bde679ad262f84c726aa070c21c043a80c8b9fd2e12324e8e' 
  AND token = 'YQBvFFEdRMuxvNP++7ehmXoJZfnnNCdGUcvmT5oGoXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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