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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd79e60d742426bde0327a582cbeb18c1af08595cff34a7a36a6c3b1301dc04b' 
  AND token = '4gLGEtOJnA7FQeEO5LynnSjZ2jOfCdSjd+mJZrTiMkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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