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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f959370fb2b70309e0972ebe1c28b12ebcc64534de94a556efca9236c39dd3' 
  AND token = 'w/DLXXJql1slcICjuM+Bkdapn8YodQvWeoDq8oLr0hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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