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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a34aed5b9d30cb0ff0636bf0127683f9151d440cb41f58c735a8c988c50b777' 
  AND token = 'QM1sXAYtqD2cbhjKUJ5diq317OiwwUrKfNGZ/GdrMqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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