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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c694e9b2c5c8b01a2d96b89ed4eb54fdf9cff674ba081eaba4d661efb08e7610' 
  AND token = 'jZHU3LJYaQUXIOO4D+1pS2pz4aXfixVTiMPwWB0MnZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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