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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edaa45855664e44327f9920bf7e3f9284bb6d7c73556e8d7d2e89ebf8fe1eaaa' 
  AND token = 'xjzrlrKQOJqjxF7F1mwWsNS+kPyBI3W9jFxRiLItaac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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