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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5475f479efdf1a91562fbdf471006930c861322e7d2ecbd041e70b42fad22882' 
  AND token = 'tYyd78LSBIQT3u1PoqzWniGzljijIEIYzSpSX/prpuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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