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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '059fd9fccf14ac13aa3ea231140d7dc47dfb27283293fd24d0926bf6a7a6d958' 
  AND token = 'TGwl563eOEO5V61EtA7Du7hsIkOuR/mAwSsaXnYC8KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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