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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e54023fcdb670f786fd777ce821b7e05f38b1593c71df676134d56249b0dc387' 
  AND token = '3lgiUqVz+cjrs2eFSr4ywR60UFSFshOciEAVVgkE0hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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