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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a72bf8306b89472b18fa3565a5dd61fbd7d64db541c7f7c2af3dbfc7a954c36f' 
  AND token = 'D31a2ZE3cucEMm0T76114OtjAJvKCyFVkgXSrwKM91Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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