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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f64a9775bcdc4d00f3886b619d3aea8d535600c8a5413cc33ca6bbca92dfb608' 
  AND token = 'kTEUC3H6PLrih5FO1HjBNuBMFxUZEzZQqWaXLowhdoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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