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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '698edb025cbf03675397f4173eeab0118427c1225fd47776d517bf085dafc474' 
  AND token = 'C4cC5Lkpkom1X2sLp/KT/1Ohpvx56r3fvmX1epyMoJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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