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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ad32c3f4b95bfbbaab5c0ebd96b1ef2ec533635f019bd4fe6774e5d1dba3f8' 
  AND token = 'fajeuNTZn8eqgb9aQFj1KR9cmnwszB2P3HbLK6+TvCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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