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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d00f20a33fa69dc948dfc14c10030a93d736c6df2989cb392534bf98a23747f' 
  AND token = '6DSYO4vOtyG1MAkaM9D9SIwAw6889+dWJHhaNLQUamg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

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