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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9dfae5ff8e64c8757d634c8d7d81cc6dd57a8eea905e4e88c86902276085d6' 
  AND token = 'D4Vb55qmUWm3DzjpgRtnbH1QB6wMMtR7RVqIO+nSf0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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