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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '723f164c00967aace10157577e04cbb3a150544e474be9bc3e6eef50f2312419' 
  AND token = 'EzgtbYorSI+AUOcespItk/8g5jO83HZz0fDvdJ8B9Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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