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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89827e68f208dfa39f80f866a42400ec4d53c375ec03d63c104749e0c31d0507' 
  AND token = 't4/wiXwvK4DcZ8Ytuf/wmAL4fgh/B9Azyr1FnHHXHXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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