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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c81692b30b423cb4cc514fea364155d3d235478d4b7988da6fc97b1bda50339' 
  AND token = 'z/2stDkpBtpfFl434otOeWyAo+T7nJcwdPa++MHSd1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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