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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b762414ff1c8050f6b6016102dd4e9cc3ed84bcf0cb263cd040fa8d1717b39a6' 
  AND token = 'WsQTKp7hi1gzMSOmPMV17Wfj2lujGkPzjL3JV7AIJDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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