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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd08133b1074399aaded823c3fd99c0b049f8a5bf9f004e1015a05a84d07dd996' 
  AND token = 'qNrGWqIAcyPq6lsqKgMrtMgRgxPMRsgUHD1yLezT4hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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