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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d2ff48fce8c9eb275ea060a790a248e0fb103a5b6732c58ca53ef5a7390389e' 
  AND token = 'kJ4LusdStWUY13SLEOkEwAyCQHD8wbRptSND+VLTyi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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