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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbfc6c834313494a54d1133c02df8e84a8c45e441cfd2b568ed2d1ad5a5d06c7' 
  AND token = 'HrnHEN9jJmFdTNFutxv2umvPdxIgJMw0W+pViuLD0Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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