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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39380c911ea88d0a9d6336fc8c8b668fe06e7ccba238f94a77fa574328a72dae' 
  AND token = '3JLqHZSzHmts7yuCskr9w9jXT8EeNnsOmMEbV6WRsCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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