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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebafe3c96dc99cbec40038cd325644e629ea68d4525606336a9424d7c3c1e429' 
  AND token = 'MDmIw7IjP4VC8RT8804ao0HlxjexDT0hmIECLzP2DBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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