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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84ab2fa1c959c3de009c18e68d64b282dfdf119ad0e7c1751456d6ec98e6aa4' 
  AND token = 'tmqnGBzymNqrDO0mSbsxQepaLtL6fO6W7ErGxOSFm70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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