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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47d2c5b65976a2451b6c361c28a16d53f7dfc56ee84dd4452ee1bb7d633cb1c' 
  AND token = '1RbFkjk0yTgKLjn958T4V4hSxlk88ZOMBAKrKeBh2/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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