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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '788666fde38b78a51adc53b0762cde940fe937103fe5a47dda3d6d7ce2b97c0e' 
  AND token = '/OWe3LY8exwhTknxs64XvprgpJC07m5LkNiEL2aTHxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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