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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05b5db14f5ff46afe70aa0c880b41e37dfe6f98edf0761936b3423243f4c8ab1' 
  AND token = 'vG656qWO9S1scJF8oF9qV47AOwS+aYQENSBIo3shLwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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