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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '354cdbbbde00867a5d521951d358433c3c10e2c71bace017b6e35d4e219481a9' 
  AND token = 'lNmez0uzNNjs5ZG4x/oUW2Fe7y72jhseVhXtP0cfE7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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