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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f06037e853dc5a190d6b7863dfc0c7479eeb34337a93d9da2dd991630c24091' 
  AND token = 'jMsVx8xuf7tfqa/VKFDI3YdXmyafzuuMjqA7vWQOlJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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