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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5604582218898f8833423692accdeab55389564e5818928cd80f2e51ac5676c2' 
  AND token = '8g9bAhnl3/MI85e/ZhilB9u/GniegicMi710IrwHdow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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