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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69db1a2a34cf15c6b10768f9c3b261cba9d5d7e54375aaa29cce189c6d28096d' 
  AND token = 'VwCb3g9RpTCyz62Z/ctHh/7Rsk7+bizr6QiQJbAs2R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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