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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30050d974257704b0342f15ca4b1f9ac41a7add4f19d0ce8968e96d3e830fa39' 
  AND token = 'MQ8DrbVBVejM7x1oKXxrt75hzg608q6MlPIourOM7Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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