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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95abb4f97fbbd1e1df04b9293e78b3adb0147c0abcdcb738ab558e03ff433ec' 
  AND token = '6tWexMagp/V+0oac5nWk7D7bj/xdvbszKUW+3RV6/yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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