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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dbce4e46ef7e93ebda9041ef3c54aeb17e9ff6b2e1e814e7620147c40bbd600' 
  AND token = '/13IS1R/Fn2foMF5GvWEE2E6Dv7nWXmgizLaTtbIJBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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