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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ca364a5aca89c6959c910d0eb53abb9f00f984d78b0a92319226c581dadd60' 
  AND token = 'kvxITvZ0sWX8inbO8cxOXfvmWWns8/31tpwm5V2me6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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