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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d9496cba86fe371c9d9378988f4a129d716a84de95cb6706920021c1c1a6b1e' 
  AND token = 'HYL1ZeQFVasEOkEv08nu3b6qA2N9Zkc7Se2pTp0xSOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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