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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0069da4357dfc424913d5fd3780460af41e22970779ed600445bf3465b3cfb7d' 
  AND token = 'gNiii/MH1tDH6fu/jEHb+e46U29sJcVsR1L5X+E8JS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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