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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac0f55181f2feb2a3d6c4db600d6d75c54d455c8c120d9e9c509afe89f868c7' 
  AND token = 'QqBnN/VXWp7uHPNh5WyC/kXhai600MG72w1b+1h2B88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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