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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83c01488c0968a1d0f785ba5ff97d7937204643445ec1464b5f0853d286a5cd' 
  AND token = 'Q4b1qeTDh4i8iUofU9I2UBWkc9NJjNSjh9vOjF9Vy5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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