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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31af53d22fb43d54e8ec14c4ed7f45bc004c7dc5fb2254baf1ba17717614deb' 
  AND token = 'vSjzIfDs+0BfVle4Bq/zJlwiQ5L5daz17M3j/IMIuX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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