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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '792f2770fe5bbc265474f285474c7adf559d3ff5cfc810d98ce28baba890292c' 
  AND token = 'rd3zze0s83EwIwXsTqaA3qVhCLwbCeZwr/WL3waWeeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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