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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cafbdb45c8aaa5c9f66b1412c67f58890c56c69f813b9353b42781bc8625081b' 
  AND token = 'hwqyQt1bXa+XlOBy7Z4Q3tHYwGzc0B3J1haY1fa6/cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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