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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39460f5e7c0eec2e1edb1a61e512f865b48c7e70eb2850cb327aab3a211095ae' 
  AND token = 'sA+7P2NbDsVxe3b6Dlg6C+p2sI5s5V0pMmEMaEy+6As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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