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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44e69567306d70336bcc030b9a6531b4acc35ff2eccab5aaf602c74347a378d6' 
  AND token = 'L5FSDN9uMsyJDNubBlD/wSMkE5C0O4u6kYLyesQa844=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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