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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cc9f84824335d8468026cf92e4a9780379b18775554259fb2f4a6f6be9bd2ae' 
  AND token = 'upZuW3kjk5tYFSRnL6auq0xfvX8KOYJIWm5Km90VNbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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