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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b927f142711c52975ddd238d8f2a8ef2eb6ecd35be1448aebd474657f2173ea' 
  AND token = 'TZw9AJQ8LIEGryGMZAZHGghEtvD5J5JSLjSGzj5tLZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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