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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cfc63581bc6cc5655e83e87fe748f3d570b817a53cd081f635d18801ab9de9b' 
  AND token = '8kDIcxst60ve2WU9WnDwDBjqMkSI53nZA1F1rz3l8wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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