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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffae71294e93c84dea058c110ea8e19ed265fea25e5c211e1d30ac2a320bafcc' 
  AND token = 'q3hmDkiRnLZiTUXXD2gFXtLzPzvKptVks108Qp5s2RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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