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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed9ace3f30a1b390463f14ed04158a2bdaa31853f03f3a6f2dcf44603009c606' 
  AND token = 'dCKgQHUQBNAcrJfROjw9S8nmCI85fFQuU+dVF/sYDUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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