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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f7bb45f29d6f266afe6a93465aa2c112dad27a0ed23fb6df7a8d1111732c3d' 
  AND token = '/9PDbx/VSjWZCHvLJFi/0rOQVJ6N21WqnkKzi/8xZfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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