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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfaf5c412dc60f47c1e5fe5ad3f3d25fb3be53ac84c1cdf65cceb3eafe54e525' 
  AND token = 'RExUxzH2b+k46JUsqof7UV1nDiDGuSVY4ZffxtBKDqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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