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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b23d2ba514aa297ac8d3ae4d07004207ca2f79806b1ed497674e38735e34dd' 
  AND token = 'VrbwWQ1bxWVu21X2JMyBw2vD2Dms/oOwVylTXuXiFiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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