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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c3e2c1ae6328b87a7229f0edd3a3b235e122d14bbc8c0c19ef0a6d4a1311c1f' 
  AND token = 'FuEZfkkshd9KVQUoiQI6KMlPONx0RSD6UHzyXobZsQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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