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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3dde9e836b3b4967de397d960a48e0ce4e3a7f6c02b00686b8f030407e2711' 
  AND token = 'cH8WD9HlNp4TZQdpvNd9yZ4qG79Fgv28RPtd4y+ibLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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