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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd19505ed164a178eea1697ae08d24fb12de938ca5dabe3459eb53f541c34ddfe' 
  AND token = '2oTMl8ERXwVgZav4HkqNZfXKGTxZ+9sP6zD6pdMV2kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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