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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c9463e34f4ba6c37c0faf1d1ef94ecc7a31e5e21d8c3cda22ffa59ac96cfad' 
  AND token = 'WZMxN4TS6pU0yEYdbf0cBssnAKvC0oy9qOBV35m17lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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