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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c35263d5c1192ccc7b5a612be5eee3322d81ab326b11ba29c59e41d347bcb50e' 
  AND token = 'pms5iXO3Wdms/6Y1G6hLehyftR0D6v1AzrbsGEP47ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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