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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '223d2f6f064c65eb2a24e8cb3725b121568f86a55d6b4ab25dd31215ea36c7d4' 
  AND token = 'vWVT/xVFug0GMADxBaWfBjWp2iqaKoav2qhvxPHedAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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